What does Pure Delite do?

[leoh]

Hi everyone.
I have a RockShox SID RACE 2007.

It has 3 air chambers: on the left side, one positive and one negative.
On the right side, it has a positive air chamber, and on the lowers it says it's a system called "Pure Delite" and it should have between 20 and 60 PSI.

The doubt I have is... what does the Pure Delite system do?

I only know that the chambers on the left side set how "hard" or "soft" the fork is, but on the users manual it also says something like that about the right side.

What should I do?

Thanks!